* {
    padding: 0;
    margin: 0;
    list-style: none;
    box-sizing: border-box;
}

i {
    font-style: normal;
}

a {
    text-decoration: none;
    display: block;
}

img {
    display: block;
}

html,
body {
    height: 100%;
    width: 100%;
}

.container {
    @extend html;
    background: #f5f5f5;
    font-size: 14px;
    display: flex;
    flex-direction: column;
    background: url();
}

header{
    background: red;
    width: 100%;
}
main{
    background: yellow;
}
footer{
    background: blue;
}